0

如果不存在，我想在当前请求 URL 中添加两个 queryString

编辑：

我试过这个---

public override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (filterContext.RequestContext.HttpContext.Request.QueryString["mid"] == null && filterContext.RequestContext.HttpContext.Request.QueryString["mod"] == null)
{
mid = Convert.ToString(HttpUtility.ParseQueryString(filterContext.RequestContext.HttpContext.Request.UrlReferrer.Query)["mid"]);
mod = Convert.ToString(HttpUtility.ParseQueryString(filterContext.RequestContext.HttpContext.Request.UrlReferrer.Query)["mod"]);
if (!string.IsNullOrEmpty(mid) || !string.IsNullOrEmpty(mod))
{
RouteValueDictionary redirecttargetDictionary = new RouteValueDictionary();
NameValueCollection Qstr = null;
if (filterContext.HttpContext.Request.RequestType == "GET")
{
Qstr = HttpUtility.ParseQueryString(filterContext.HttpContext.Request.Url.Query);
foreach (string item in Qstr)
{
redirecttargetDictionary.Add(item, Qstr[item]);
}
if (Qstr["mid"] == null)
{
redirecttargetDictionary.Add("mid", mid);
}
if (Qstr["mod"] == null)
{
redirecttargetDictionary.Add("mod", mod);
}
filterContext.Result = new RedirectToRouteResult(redirecttargetDictionary);
}
}
}

这段代码工作正常。- 检查 quesrystring 是否存在，如果不存在 - 然后从 'Urlreferrer' 中获取 qstring 值 - 如果请求类型是 GET - 然后添加两个带有现有查询字符串的查询字符串

但是，如果当前请求中的查询字符串的null值 urlhttp://localhost:53372/question/index?type=&stage如b null 然后在再次点击操作之前OnActionExecuting()首先调用'if'不正确然后index方法调用但我没有得到类型 n 阶段查询字符串，假设为 null 我在地址栏中找到的 url 是http://localhost:53372/question/index?mid=1&mod=5。如果我删除过滤器，我在http://localhost:53372/question/index?type=&stage=&mid=1&mod=5这里得到了 URL，虽然它为空，但我得到了两个阶段 n 类型的查询字符串。

已编辑——

[HttpGet]
        public ActionResult Index(ProjectType? projectType, int? projectStageID, int? page)
        {
            int currentPageIndex = page.HasValue ? page.Value - 1 : 0;
            IPagedList<ProjectModule> moduleList = null;
            IDictionary<string, string> queryParam = new Dictionary<string, string>();
            queryParam["ProjectType"] = string.Empty;
            queryParam["ProjectStageID"] = string.Empty;
            ViewBag.ProjectType = null;
            ViewBag.ProjectStage = null;
            ViewBag.message = "";
            if ((projectType != null || projectType.HasValue) && projectStageID.HasValue && page.HasValue)
            {

                queryParam["ProjectType"] = Request.QueryString["ProjectType"];
                queryParam["ProjectStageID"] = Request.QueryString["ProjectStageID"];
                //
                //Set View Bag
                //
                ViewBag.ProjectType = Enum.Parse(typeof(ProjectType), Request.QueryString["ProjectType"]);
                ViewBag.ProjectStage = Convert.ToInt32(Request.QueryString["ProjectStageID"]);
                //
                // Set Query String formcollection for Pagging purpose
                //           
                ViewBag.QueryParam = queryParam;
                moduleList = new ProjectModuleService().GetProjectModulesByProjectStageID(Convert.ToInt32(Request.QueryString["ProjectStageID"])).ToPagedList(currentPageIndex, Utility.ConstantHelper.AdminDefaultPageSize); ;
                if (moduleList.Count == 0)
                {
                    ViewBag.message = "Record(s) not found.";
                }
                return View(moduleList);

            }
            else
            {
                if (!string.IsNullOrEmpty(Request.QueryString["ProjectType"]) && !string.IsNullOrEmpty(Request.QueryString["ProjectStageID"]) && !string.Equals(Request.QueryString["ProjectStageID"], "0"))
                {
                    if (!string.IsNullOrEmpty(Request.Params.Get("Index")))
                    {
                        queryParam["ProjectType"] = Request.QueryString["ProjectType"];
                        queryParam["ProjectStageID"] = Request.QueryString["ProjectStageID"];
                        //
                        //Set View Bag
                        //
                        ViewBag.ProjectType = Enum.Parse(typeof(ProjectType), Request.QueryString["ProjectType"]);
                        ViewBag.ProjectStage = Convert.ToInt32(Request.QueryString["ProjectStageID"]);
                        //
                        // Set Query String formcollection for Pagging purpose
                        //           
                        ViewBag.QueryParam = queryParam;
                        moduleList = new ProjectModuleService().GetProjectModulesByProjectStageID(Convert.ToInt32(Request.QueryString["ProjectStageID"])).ToPagedList(currentPageIndex, Utility.ConstantHelper.AdminDefaultPageSize); ;
                        if (moduleList.Count == 0)
                        {
                            ViewBag.message = "Record(s) not found.";
                        }
                        return View(moduleList);
                    }

                    else if (!string.IsNullOrEmpty(Request.Params.Get("Create")))
                    {
                        return RedirectToAction("Create", new { projectStageID = Convert.ToInt32(Request.QueryString["ProjectStageID"]) });
                        //return RedirectToAction("Create", new { projectStageID = Convert.ToInt32(Request.QueryString["ProjectStageID"]), projectType = Enum.Parse(typeof(ProjectType), Request.QueryString["ProjectType"]) });
                    }

                }
                if (Request.QueryString["ProjectType"] == "" || Request.QueryString["ProjectStageID"] == "" || string.Equals(Request.QueryString["ProjectStageID"], "0"))
                {
                    ViewBag.message = "Please select all fields.";
                    return View();
                }
                return View();
            }
        }

我在做什么错？

4

1 回答 1

0

这里我的理解是，如果 URL 中没有查询字符串，则需要添加两个查询字符串参数。如果您要显式添加这两个查询字符串参数，则它将是该查询参数的默认值。

最好在操作方法中提供默认值，而不是在 URL 中添加查询参数。您可以通过以下代码实现。

public ActionResult ComposeEmail(int queryParameter1 = 0,string queryParameter2 = string.Empty)
{
}

如果您有任何疑问，请告诉我。

于 2012-10-31T08:06:32.433 回答